diff --git a/requirements.txt b/requirements.txt
index c3364f8..9862dd3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -52,5 +52,5 @@ testpath==0.3.1
 tornado==5.0.2
 traitlets==4.3.2
 wcwidth==0.1.7
-Werkzeug==0.14.1
+Werkzeug==0.15.5
 widgetsnbextension==3.2.1